FreeBSD/ports ba7d7f8 (r518041)www Makefile, www/yarn-node12 Makefile

www/yarn-node12: Add new slave port

Add yarn-node12 slave port after the release of Node.js 12 as stable
DeltaFile
+13-0www/yarn-node12/Makefile
+1-0www/Makefile
+14-02 files

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